Flexible transmission



June 29 1926.

E. CARETTA FLEXIBLE TRANSMISSION -Filed March 1&5

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,Paieme June ze, i926.

jUNiTED STATES PATENT' OFFICE. "f'

'FLEXIBLE TRANSMISSION.

Application led I arclrlS, 1925, Serial No. 16,527, and in Italy March24, 1924.

The present invention relates to Aflexible transmissions of` the wellknown Bowden type', and comprises means for mounting and disconnectingthe transmission parts with respect to members to which'they areconnected, and means for adjusting the length of its outer sheath, inorder to obtain the best operation of the .transmission under anycircumstance.

ln the annexed and v `Figure 1 shows a transmission withinteri'uv'mediate portions in dottedlines` I wire coil in end of thecord 6 is connected with longitudinally.

Figure 2 kis a central sect'on of the device for adjusting the lenghofthe outer sheath, Figure 3 shows separately in. perspective vviewmeans for connecting the inner transmission cord withfa member to' beattached thereto, and 'i Figure 4 shows a modified construction. Asshown .inFi ure 1, in which tlietransmission is assume to be operated bya' controlling member 1 reciprocablein a. stationary guide member 12 andto drive'a part 2 mounted to reciprocate in a stationaryguide member 4,the transmission comprises a' sheath 5 consisting as usually of fa metalwhich is located. 'a f' y flexible cord 6. Y s

According to the present invention `each arts intended to control vit`or to be shifted t ereby, res etively, by means of a fork engagin a soulder of saidcord land leaving the said cord free to rotate` arounditsown axis .p

` other andthe length of the entire sheath with respect to said :forkandv themember connected with it, the cord being thusfprevented fromreceivin torsional stresses 'which would make har the actuationof theparts. v 1 V A construction of said engaging device is shown in Fi re 3where the movable member 7 provi es a yoke 8 having two stragshaped ends8-8 which strapse'mbrace t e cord 6 while leaving it free torotate, anda sleeve 9 fastened on said cord intermediate said straps 8-8 andengaged between them The cord nal direction withv the member 7 while itis free to rotate with res ectto it.

YIn the embodiment o Figure 4 8 rovided on the movable member 7, saidfor loosely embracing the cobrd and being drawing is shown-by way ofexampleA an embodimentof this invention,

of said the engag ing device comprises a single fork memberand sheathbore will have such a respective size as topermit for freely removingthe cord 6 from its sheath by withdrawing it longitudinally therefrom.

The sheath is`connected with the stationary parts 4 -12 of thetransmission byproviding in the bore of said thread 13 correspondingVwit the coil 1 of the wire roviding saidsheath and the ends cathare'screw'ed in said bores;

arts a screwy thusl is avoidedthe provision of attaching fittings at theends of said sheath, which would impair the ilexibility of the sheath onaccount of their own rigidity.l

The said bores are preferably flaring or tapering outwardly as shownlat`10, in order to permit the sheath 5 ofmoving freely at the pointswherdllt extends into said stationary member withoitscraping againstsharp" ed es which would affect it.

el length ofthe sheath is adjusted by the device shown in section in Fire 2, said device 4comprising' a sleeve v11 aving yin its `bore twoopposite vscrew threads 14 adapted to be screwed on lthe sheath coil;

. in combination with` said sleeve 11 two sheath sections are usedlwhich have' reverse pitches to provide coils or. screw threadedsurfaces of reverse `'pitch intheir 'adjoining ends. Thus by rotatingthesaidsleeve the ends of the sheath sections ,are caused .to aproach o rmove away with respect 'to each ina be adjustedv according tocircumstances.

he sheath sections could also be coiled engaged in a sleeve with ascrewthreaded bore having a itch of uniform direction the adjustmentbeing in this case .eected by rotating each section to cause' 1 ttoenter or come oi more or less with respect to said sleeve.`

With the described corustructionk the transmission elements are al1independent froml each other and thus tite mountin andremoval of theparts as well as their ad1ustment is made easy. 0

For removing the parts it is suiiicient to unscrew one of the sheathsections from the members in which it is engggedlthen the yoke 7 "of oneof the me ..rS attached to iop the cord 6 is removed therefrom and the vcord is thus'freeto be withdrawn from its sheath. t rlphe parts aremounted together in operativev condition -by proceeding in reversemanner andthe sheath length is easily ad- ,justed by the describedarrangement.

`total sheath length and means for engaging i Asaid cord with parts tobe connected therewlth said engaging means providing for the freerespective Irotation of said cord and members connected therewith andcomprising parts' carried by said members lfreely embracing said cordsand abutment parts fastened on said cord to engage said .em-

' fastened on said cord to 'engage said bracing parts in the directionvof the cord length. l.

2. A flexible transmission comprising an inner flexible cord, sectionsof a wire coil sheath embracing said cord, means for fastening the endsof said sheath sections on stationary parts, means for adjusting thetotal sheath length and means for engaging said cord with parts 't beconnected therewith said engagmg'means'providing for the free respectiverotation of said cord and members connected therewithl and comprisingparts carried b said members freely embracing said cor s and abutmentparts embracing parts Aina the direction of the cord length, saidabutment parts having a smaller diameter than the bore of said sheath,

3. A flexible transmission comprising. an

" inner flexible cord, sections of a wire 'coil sheath embracing saidcord', means for fastening 'the-ends of said sheath sections onstationary parts', meansfor adjusting the total sheath length, a-sleevefastened on said cord, a member to be connected with said cord and partson said member loosely embracing said cord and 'abutting on the ends ofsaid sleeve.

4. A flexible transmission-comprising an innerflexible cord, sections ofa wire'coil sheath embracing said cord, means for fas.

- sheath said means comprising a part having a screw threaded boreadapted to engage the ends ofsaid sheath sections.

5. A 4flexible transmission comprising an inner flexible cord, sectionsof a' wire coil sheath embracing said cord, means for fastening the endsof said sheath sections on stationary parts, .'means for engaging saidcord with members to be connected there- -with and providing for thefree respective rotation of said cord and 'members, and

means for adjusting the total length ofsaid sheath said means comprisinga part having a screw threaded bore comprising reversely 4threadedportions at its ends to engage reverse coil surfaces of said sheathsections.

6. A lexible transmission comprising" an l inner flexible cord, sectionsof a wire coil sheath embracing said cord, means for fastening the endsof said sheath sections on stationary parts said means comprising a parthaving a screw threaded bore adapted to engage the end of a sheathsection and engage its coiled surface, means for adjusting the totalsheath length and means for engaging*v said cord with members to beconnected therewith and providing for the free respective rotationofsaid cord and members.

7. A flexible transmission comprising an inner flexible cord, sectionsof a wire coil sheath embracing said cord, means for fastening the endsof said sheath sections on stationary parts said means comprising a parthaving a screw .threaded bore adapted to engage the -end of a sheathsection and having an outwardly flaring mouth, means for adjusting' thetotal sheath length and means for engaging said cord with members to beconnected therewith and providing for the free respective rotation ofsaid cord and members.

In testimony whereof I have signed myl name to this specification.

ETTORE casema.'

